#pragma once

#define MULTI_CONVERTER_NUMBER_DIGITS       9

typedef enum {
	EventTypeKey,
} EventType;

typedef struct {
	InputEvent input;
	EventType type;
} MultiConverterEvent;

typedef enum {
	ModeDisplay,
	ModeSelector,
} MultiConverterMode;

typedef enum {
	None,
	Reset,
	Convert,
} MultiConverterModeTrigger;

// new units goes here, used as index to the main multi_converter_available_units array (multi_converter_units.h)
typedef enum {
	UnitTypeDec,
	UnitTypeHex,
	UnitTypeBin,

	UnitTypeCelsius,
	UnitTypeFahernheit,
	UnitTypeKelvin,

	UnitTypeKilometers,
	UnitTypeMeters,
	UnitTypeCentimeters,
	UnitTypeMiles,
	UnitTypeFeet,
	UnitTypeInches,

	UnitTypeDegree,
	UnitTypeRadian,
} MultiConverterUnitType;

typedef struct {
	MultiConverterUnitType selected_unit_type_orig;
	MultiConverterUnitType selected_unit_type_dest;
	uint8_t select_orig;
} MultiConverterModeSelect;

typedef struct {
	uint8_t cursor;            // cursor position when typing
	int8_t key;                // hover key
	uint8_t comma;             // comma already added? (only one comma allowed)
	uint8_t negative;          // is negative?
} MultiConverterModeDisplay;

typedef struct MultiConverterUnit MultiConverterUnit;
typedef struct MultiConverterState MultiConverterState;

struct MultiConverterUnit {
	uint8_t allow_comma;
	uint8_t allow_negative;
	uint8_t max_number_keys;
	char mini_name[4];
	char name[12];
	void (*convert_function)(MultiConverterState * const);
	uint8_t (*allowed_function)(MultiConverterUnitType);
};

struct MultiConverterState {
	char buffer_orig[MULTI_CONVERTER_NUMBER_DIGITS + 1];
	char buffer_dest[MULTI_CONVERTER_NUMBER_DIGITS + 1];
	MultiConverterUnitType unit_type_orig;
	MultiConverterUnitType unit_type_dest;
	MultiConverterMode mode;
	MultiConverterModeDisplay display;
	MultiConverterModeSelect select;
	uint8_t keyboard_lock; // used to create a small lock when switching from SELECT to DISPLAY modes
                           // (debouncing, basically; otherwise it switch modes twice 'cause it's too fast!)
};